Wisconsin Water Quality Ratings

TapWaterSafety has rated 13 public water systems in Wisconsin, serving a combined 2,465,158 residents. The statewide average grade is F.

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
State average grade
F
55/100
Total utilities rated 13
Population served 2,465,158
Most recent test 2024
🇪🇺 Would fail EU standards 1 of 13

Top water quality concerns in Wisconsin

  • PFAS contamination
  • Total PFOS and PFOA significantly above health guideline
  • Haloacetic acids (HAA9) significantly above health guideline
  • Perfluorohexane sulfonate (PFHXS) significantly above health guideline
  • Total trihalomethanes (TTHMs) significantly above health guideline

Cities in Wisconsin

Browse tap water quality reports by city. Click any city to see its grade, what's in the water, and recommended filters.

EAU CLAIRE
F 70,587
GREEN BAY
F 107,369
JANESVILLE
F 64,415
KENOSHA
F 99,218
MADISON
F 272,000
MENASHA
F 74,511
MILWAUKEE
F 626,000
Madison
D 259,000
Milwaukee
D 590,000
OSHKOSH
F 63,000
RACINE
F 105,100
WAUKESHA
F 70,718
WEST ALLIS
F 63,240

Grade distribution

A
0 (0%)
B
0 (0%)
C
1 (8%)
D
8 (62%)
F
4 (31%)

All rated utilities in Wisconsin

Sorted by score, highest first. Click any utility to see the full grade card.

Rank Utility City Population Score Grade
#1 Milwaukee Water Authority Milwaukee 590,000 65 C
#2 Madison Department of Public Works Madison 259,000 60 D
#3 MADISON WATER UTILITY MADISON 272,000 56 D
#4 EAU CLAIRE WATERWORKS EAU CLAIRE 70,587 56 D
#5 MILWAUKEE WATERWORKS MILWAUKEE 626,000 55 D
#6 WEST ALLIS WATERWORKS WEST ALLIS 63,240 55 D
#7 RACINE WATERWORKS RACINE 105,100 55 D
#8 WAUKESHA WATER UTILITY WAUKESHA 70,718 55 D
#9 APPLETON WATERWORKS MENASHA 74,511 55 D
#10 JANESVILLE WATER UTILITY JANESVILLE 64,415 54 F
#11 KENOSHA WATER UTILITY KENOSHA 99,218 50 F
#12 GREEN BAY WATERWORKS GREEN BAY 107,369 50 F
#13 OSHKOSH WATERWORKS OSHKOSH 63,000 50 F